It appears that Larry M. Smith <ietf....@fahq2.com> said: >You are correct and I agree completely that the exact same problem >exists for current and historical mail flows. > >I just wish that things like mailing lists didn't do that. In fact, I >have been told recently that some will formulate messages differently >based on the sender's envelope's DMARC policy. I have not been able to >verify this yet.
Not the envelope but the From: header domain's DMARC policy. Lots of lists do that including this one, rewriting the From: address into one that will survive DMARC handling. >I would like to make the argument that such modification to the end-user >viewable parts of the message, like what is happening on this list, is >superfluous E.g.; > > > Subject: [Ietf-dkim] [...] >[...] >> _______________________________________________ >> Ietf-dkim mailing list -- ietf-dkim@ietf.org >> To unsubscribe send an email to ietf-dkim-le...@ietf.org > >Superfluous because of RFCs 2369, 2919, and 8058... I'm sure that there >are others. The problem is that recipients apply the From: domain's DMARC policy without regard to whether the message might have come through a list. When ARC came along I asked someone at a large mail provider why they don't just whitelist familiar mailing lists. The answer was basically that lists do a lousy job of spam filtering, and it is unfortunately common for an otherwise benign list to start gushing spam when spammers buy stolen address books. use pairs of (to, from) from an address book that happens to include the list and some subscribers. ARC was supposed to fix that by providing a look back at the authentication results before the list did what it did, but that turned out not to work because you had to believe that the ARC signers were telling the truth. The plan here is to show their work so you don't have to trust them, you can unwind the changes and see what they did. R's, John _______________________________________________ Ietf-dkim mailing list -- ietf-dkim@ietf.org To unsubscribe send an email to ietf-dkim-le...@ietf.org
